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Wren is a small, fast, class-based concurrent scripting language

Think Smalltalk in a Lua-sized package with a dash of Erlang and wrapped up in a familiar, modern syntax.

System.print("Hello, world!")
classWren {
flyTo(city) {
System.print("Flying to %(city)")
}
}
var adjectives =Fiber.new {
["small", "clean", "fast"].each {|word|Fiber.yield(word) }
}
while (!adjectives.isDone) System.print(adjectives.call())

  • Wren is small. The VM implementation is under 4,000 semicolons. You can skim the whole thing in an afternoon. It's small, but not dense. It is readable and lovingly-commented.

  • Wren is fast. A fast single-pass compiler to tight bytecode, and a compact object representation help Wren compete with other dynamic languages.

  • Wren is class-based. There are lots of scripting languages out there, but many have unusual or non-existent object models. Wren places classes front and center.

  • Wren is concurrent. Lightweight fibers are core to the execution model and let you organize your program into an army of communicating coroutines.

  • Wren is a scripting language. Wren is intended for embedding in applications. It has no dependencies, a small standard library, and an easy-to-use C API. It compiles cleanly as C99, C++98 or anything later.

If you like the sound of this, let's get started. You can even try it in your browser! Excited? Well, come on and get involved!

Build Status

About

The Wren Programming Language

wren.io

Topics

compilerlanguagevm

Resources

Readme
License
Activity

Stars

1 star

Watchers

1 watching

Forks

0 forks
Report repository

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Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Wren is a small, fast, class-based concurrent scripting language
Think Smalltalk in a Lua-sized package with a dash of Erlang and wrapped up in
a familiar, modern syntax.
System.print("Hello, world!")
classWren {
flyTo(city) {
System.print("Flying to %(city)")
}
}
var adjectives =Fiber.new {
["small", "clean", "fast"].each {|word|Fiber.yield(word) }
}
while (!adjectives.isDone) System.print(adjectives.call())
  • Wren is small. The VM implementation is under 4,000 semicolons.
You can skim the whole thing in an afternoon. It's small, but not
dense. It is readable and lovingly-commented.
  • Wren is fast. A fast single-pass compiler to tight bytecode, and a
compact object representation help Wren compete with other dynamic
languages.
  • Wren is class-based. There are lots of scripting languages out there,
but many have unusual or non-existent object models. Wren places
classes front and center.
  • Wren is concurrent. Lightweight fibers are core to the execution
model and let you organize your program into an army of communicating
coroutines.
  • Wren is a scripting language. Wren is intended for embedding in
applications. It has no dependencies, a small standard library,
and an easy-to-use C API. It compiles cleanly as C99, C++98
or anything later.
If you like the sound of this, let's get started. You can even try
it in your browser! Excited? Well, come on and get
involved!
Build Status
About
The Wren Programming Language
wren.io
Topics
compilerlanguagevm
Resources
Readme
License
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Wren is a small, fast, class-based concurrent scripting language
Think Smalltalk in a Lua-sized package with a dash of Erlang and wrapped up in
a familiar, modern syntax.
System.print("Hello, world!")
classWren {
flyTo(city) {
System.print("Flying to %(city)")
}
}
var adjectives =Fiber.new {
["small", "clean", "fast"].each {|word|Fiber.yield(word) }
}
while (!adjectives.isDone) System.print(adjectives.call())
  • Wren is small. The VM implementation is under 4,000 semicolons.
You can skim the whole thing in an afternoon. It's small, but not
dense. It is readable and lovingly-commented.
  • Wren is fast. A fast single-pass compiler to tight bytecode, and a
compact object representation help Wren compete with other dynamic
languages.
  • Wren is class-based. There are lots of scripting languages out there,
but many have unusual or non-existent object models. Wren places
classes front and center.
  • Wren is concurrent. Lightweight fibers are core to the execution
model and let you organize your program into an army of communicating
coroutines.
  • Wren is a scripting language. Wren is intended for embedding in
applications. It has no dependencies, a small standard library,
and an easy-to-use C API. It compiles cleanly as C99, C++98
or anything later.
If you like the sound of this, let's get started. You can even try
it in your browser! Excited? Well, come on and get
involved!
Build Status
About
The Wren Programming Language
wren.io
Topics
compilerlanguagevm
Resources
Readme
License
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Wren is a small, fast, class-based concurrent scripting language
Think Smalltalk in a Lua-sized package with a dash of Erlang and wrapped up in
a familiar, modern syntax.
System.print("Hello, world!")
classWren {
flyTo(city) {
System.print("Flying to %(city)")
}
}
var adjectives =Fiber.new {
["small", "clean", "fast"].each {|word|Fiber.yield(word) }
}
while (!adjectives.isDone) System.print(adjectives.call())
  • Wren is small. The VM implementation is under 4,000 semicolons.
You can skim the whole thing in an afternoon. It's small, but not
dense. It is readable and lovingly-commented.
  • Wren is fast. A fast single-pass compiler to tight bytecode, and a
compact object representation help Wren compete with other dynamic
languages.
  • Wren is class-based. There are lots of scripting languages out there,
but many have unusual or non-existent object models. Wren places
classes front and center.
  • Wren is concurrent. Lightweight fibers are core to the execution
model and let you organize your program into an army of communicating
coroutines.
  • Wren is a scripting language. Wren is intended for embedding in
applications. It has no dependencies, a small standard library,
and an easy-to-use C API. It compiles cleanly as C99, C++98
or anything later.
If you like the sound of this, let's get started. You can even try
it in your browser! Excited? Well, come on and get
involved!
Build Status
About
The Wren Programming Language
wren.io
Topics
compilerlanguagevm
Resources
Readme
License
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Wren is a small, fast, class-based concurrent scripting language
Think Smalltalk in a Lua-sized package with a dash of Erlang and wrapped up in
a familiar, modern syntax.
System.print("Hello, world!")
classWren {
flyTo(city) {
System.print("Flying to %(city)")
}
}
var adjectives =Fiber.new {
["small", "clean", "fast"].each {|word|Fiber.yield(word) }
}
while (!adjectives.isDone) System.print(adjectives.call())
  • Wren is small. The VM implementation is under 4,000 semicolons.
You can skim the whole thing in an afternoon. It's small, but not
dense. It is readable and lovingly-commented.
  • Wren is fast. A fast single-pass compiler to tight bytecode, and a
compact object representation help Wren compete with other dynamic
languages.
  • Wren is class-based. There are lots of scripting languages out there,
but many have unusual or non-existent object models. Wren places
classes front and center.
  • Wren is concurrent. Lightweight fibers are core to the execution
model and let you organize your program into an army of communicating
coroutines.
  • Wren is a scripting language. Wren is intended for embedding in
applications. It has no dependencies, a small standard library,
and an easy-to-use C API. It compiles cleanly as C99, C++98
or anything later.
If you like the sound of this, let's get started. You can even try
it in your browser! Excited? Well, come on and get
involved!
Build Status
About
The Wren Programming Language
wren.io
Topics
compilerlanguagevm
Resources
Readme
License
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Wren is a small, fast, class-based concurrent scripting language
Think Smalltalk in a Lua-sized package with a dash of Erlang and wrapped up in
a familiar, modern syntax.
System.print("Hello, world!")
classWren {
flyTo(city) {
System.print("Flying to %(city)")
}
}
var adjectives =Fiber.new {
["small", "clean", "fast"].each {|word|Fiber.yield(word) }
}
while (!adjectives.isDone) System.print(adjectives.call())
  • Wren is small. The VM implementation is under 4,000 semicolons.
You can skim the whole thing in an afternoon. It's small, but not
dense. It is readable and lovingly-commented.
  • Wren is fast. A fast single-pass compiler to tight bytecode, and a
compact object representation help Wren compete with other dynamic
languages.
  • Wren is class-based. There are lots of scripting languages out there,
but many have unusual or non-existent object models. Wren places
classes front and center.
  • Wren is concurrent. Lightweight fibers are core to the execution
model and let you organize your program into an army of communicating
coroutines.
  • Wren is a scripting language. Wren is intended for embedding in
applications. It has no dependencies, a small standard library,
and an easy-to-use C API. It compiles cleanly as C99, C++98
or anything later.
If you like the sound of this, let's get started. You can even try
it in your browser! Excited? Well, come on and get
involved!
Build Status
About
The Wren Programming Language
wren.io
Topics
compilerlanguagevm
Resources
Readme
License
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Wren is a small, fast, class-based concurrent scripting language
Think Smalltalk in a Lua-sized package with a dash of Erlang and wrapped up in
a familiar, modern syntax.
System.print("Hello, world!")
classWren {
flyTo(city) {
System.print("Flying to %(city)")
}
}
var adjectives =Fiber.new {
["small", "clean", "fast"].each {|word|Fiber.yield(word) }
}
while (!adjectives.isDone) System.print(adjectives.call())
  • Wren is small. The VM implementation is under 4,000 semicolons.
You can skim the whole thing in an afternoon. It's small, but not
dense. It is readable and lovingly-commented.
  • Wren is fast. A fast single-pass compiler to tight bytecode, and a
compact object representation help Wren compete with other dynamic
languages.
  • Wren is class-based. There are lots of scripting languages out there,
but many have unusual or non-existent object models. Wren places
classes front and center.
  • Wren is concurrent. Lightweight fibers are core to the execution
model and let you organize your program into an army of communicating
coroutines.
  • Wren is a scripting language. Wren is intended for embedding in
applications. It has no dependencies, a small standard library,
and an easy-to-use C API. It compiles cleanly as C99, C++98
or anything later.
If you like the sound of this, let's get started. You can even try
it in your browser! Excited? Well, come on and get
involved!
Build Status
About
The Wren Programming Language
wren.io
Topics
compilerlanguagevm
Resources
Readme
License
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
Repository files navigation
Wren is a small, fast, class-based concurrent scripting language
Think Smalltalk in a Lua-sized package with a dash of Erlang and wrapped up in
a familiar, modern syntax.
System.print("Hello, world!")
classWren {
flyTo(city) {
System.print("Flying to %(city)")
}
}
var adjectives =Fiber.new {
["small", "clean", "fast"].each {|word|Fiber.yield(word) }
}
while (!adjectives.isDone) System.print(adjectives.call())
  • Wren is small. The VM implementation is under 4,000 semicolons.
You can skim the whole thing in an afternoon. It's small, but not
dense. It is readable and lovingly-commented.
  • Wren is fast. A fast single-pass compiler to tight bytecode, and a
compact object representation help Wren compete with other dynamic
languages.
  • Wren is class-based. There are lots of scripting languages out there,
but many have unusual or non-existent object models. Wren places
classes front and center.
  • Wren is concurrent. Lightweight fibers are core to the execution
model and let you organize your program into an army of communicating
coroutines.
  • Wren is a scripting language. Wren is intended for embedding in
applications. It has no dependencies, a small standard library,
and an easy-to-use C API. It compiles cleanly as C99, C++98
or anything later.
If you like the sound of this, let's get started. You can even try
it in your browser! Excited? Well, come on and get
involved!
Build Status
About
The Wren Programming Language
wren.io
Topics
compilerlanguagevm
Resources
Readme
License
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages